Alert archive / Alabama / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 131, NWS Huntsville, AL
NWS Huntsville, AL issued this severe thunderstorm warning at Aug 31, 2017, 9:14 PM CDT for Cullman County, Marshall County, Morgan County, Alabama. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 31, 2017, 9:14 PM CDT (02:14 UTC)
- Expired
- Aug 31, 2017, 9:45 PM CDT
- In force
- 31 min
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cullman County, AL, Marshall County, AL, Morgan County, AL
The radar
The Northeast Alabama radar (KHTX), 87 km from the middle of the area, began a volume at 02:13 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 31, 11:13 AM CDT | Tornado Watch | SPC | 11 hr |
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 2.2 hours before the alert went out and 127 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 545 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 1112 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 258 m²/s²
- 0-3 km storm-relative helicity
- 347 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 11.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 31, 6:31 PM CDT, 2 hours 43 minutes earlier.
Area forecast discussion, Aug 31, 6:31 PM CDT, 2 hours 43 minutes before
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</html>Hazardous weather outlook, Aug 31, 11:25 AM CDT, 9 hours 49 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Huntsville AL 1125 AM CDT Thu Aug 31 2017 ALZ001>010-016-TNZ076-096-097-011100- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-De Kalb-Cullman-Moore-Lincoln-Franklin TN- 1125 AM CDT Thu Aug 31 2017 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...This Afternoon and Tonight... Brief tornadoes will be possible this afternoon and evening as the remnants of Tropical Depression Harvey move across the region. A Tornado Watch is in effect for portions of Northwestern Alabama through 8 PM CDT this evening for the following counties: Lauderdale, Colbert, Franklin, Lawrence, Limestone, and Cullman Counties. Additional strong to severe storms will develop across the entire area, with damaging wind gusts and torrential rainfall likely. Rainfall totals upwards of two to three inches are likely across the area, with the highest rainfall totals occurring over Northwestern Alabama, closer to the track of Harvey. Isolated higher amounts up to four inches are possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday... Isolated thunderstorms are possible during Friday, as the remnants of Harvey move into the Ohio Valley. While heavy downpours and gusty winds could accompany the stronger storms, widespread severe weather is not anticipated. Scattered thunderstorms return to the forecast next Tuesday and Wednesday, as a cold front moves across the area. .SPOTTER CALL TO ACTION STATEMENT... Activation of storm spotters and emergency management personnel is requested from early this afternoon through late tonight. 12
In the hours before
Special weather statement, Aug 31, 6:24 PM CDT, 2 hours 50 minutes before
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</html>The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 7:07 PM CDT | Special Weather Statement | HUN | Limestone | 23 min |
| Aug 31, 7:17 PM CDT | Special Weather Statement | HUN | Lauderdale | 28 min |
| Aug 31, 7:43 PM CDT | Special Weather Statement | HUN | Cullman, Morgan | 47 min |
| Aug 31, 8:28 PM CDT | Special Weather Statement | HUN | Cullman | 32 min |
| Aug 31, 9:34 PM CDT | Special Weather Statement | HUN | Madison | 26 min |
| Aug 31, 9:57 PM CDT | Special Weather Statement | HUN | Jackson | 33 min |
| Aug 31, 10:18 PM CDT | Special Weather Statement | HUN | Marshall | 27 min |
| Aug 31, 10:31 PM CDT | Special Weather Statement | HUN | Jackson | 29 min |
| Aug 31, 10:56 PM CDT | Special Weather Statement | HUN | DeKalb, Jackson | 34 min |
| Aug 31, 11:27 PM CDT | Special Weather Statement | HUN | DeKalb | 33 min |
| Aug 31, 10:22 PM CDT | Special Weather Statement | HUN | Lincoln, Moore | 38 min |
| Aug 31, 10:24 PM CDT | Severe Thunderstorm Warning | HUN | Lincoln, Moore | 15 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 2017Every severe thunderstorm warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.